diff --git a/include/rtc.h b/include/rtc.h
index 7a3d3d524b..6059688285 100644
--- a/include/rtc.h
+++ b/include/rtc.h
@@ -33,11 +33,6 @@ void RtcGetStatus(struct SiiRtcInfo *rtc);
 void RtcGetRawInfo(struct SiiRtcInfo *rtc);
 u16 RtcCheckInfo(struct SiiRtcInfo *rtc);
 void RtcReset(void);
-void FormatDecimalTime(u8 *dest, s32 hour, s32 minute, s32 second);
-void FormatHexTime(u8 *dest, s32 hour, s32 minute, s32 second);
-void FormatHexRtcTime(u8 *dest);
-void FormatDecimalDate(u8 *dest, s32 year, s32 month, s32 day);
-void FormatHexDate(u8 *dest, s32 year, s32 month, s32 day);
 void RtcCalcTimeDifference(struct SiiRtcInfo *rtc, struct Time *result, struct Time *t);
 void RtcCalcLocalTime(void);
 void RtcInitLocalTimeOffset(s32 hour, s32 minute);
diff --git a/include/siirtc.h b/include/siirtc.h
index ad13fc62f3..92e646c32f 100644
--- a/include/siirtc.h
+++ b/include/siirtc.h
@@ -54,6 +54,5 @@ bool8 SiiRtcGetDateTime(struct SiiRtcInfo *rtc);
 bool8 SiiRtcSetDateTime(struct SiiRtcInfo *rtc);
 bool8 SiiRtcGetTime(struct SiiRtcInfo *rtc);
 bool8 SiiRtcSetTime(struct SiiRtcInfo *rtc);
-bool8 SiiRtcSetAlarm(struct SiiRtcInfo *rtc);
 
 #endif // GUARD_RTC_H
diff --git a/src/m4a.c b/src/m4a.c
index 2ad2261d08..33f20455f3 100644
--- a/src/m4a.c
+++ b/src/m4a.c
@@ -41,7 +41,7 @@ u32 MidiKeyToFreq(struct WaveData *wav, u8 key, u8 fineAdjust)
     return umul3232H32(wav->freq, val1 + umul3232H32(val2 - val1, fineAdjustShifted));
 }
 
-void UnusedDummyFunc(void)
+static void UNUSED UnusedDummyFunc(void)
 {
 }
 
@@ -135,7 +135,7 @@ void m4aSongNumStartOrChange(u16 n)
     }
 }
 
-void m4aSongNumStartOrContinue(u16 n)
+static void UNUSED m4aSongNumStartOrContinue(u16 n)
 {
     const struct MusicPlayer *mplayTable = gMPlayTable;
     const struct Song *songTable = gSongTable;
@@ -161,7 +161,7 @@ void m4aSongNumStop(u16 n)
         m4aMPlayStop(mplay->info);
 }
 
-void m4aSongNumContinue(u16 n)
+static void UNUSED m4aSongNumContinue(u16 n)
 {
     const struct MusicPlayer *mplayTable = gMPlayTable;
     const struct Song *songTable = gSongTable;
@@ -325,7 +325,7 @@ void MPlayExtender(struct CgbChannel *cgbChans)
     soundInfo->ident = ident;
 }
 
-void MusicPlayerJumpTableCopy(void)
+static void UNUSED MusicPlayerJumpTableCopy(void)
 {
     asm("swi 0x2A");
 }
diff --git a/src/rtc.c b/src/rtc.c
index 08d5ec4c98..54c176dbaf 100644
--- a/src/rtc.c
+++ b/src/rtc.c
@@ -215,7 +215,7 @@ void RtcReset(void)
     RtcRestoreInterrupts();
 }
 
-void FormatDecimalTime(u8 *dest, s32 hour, s32 minute, s32 second)
+static void UNUSED FormatDecimalTime(u8 *dest, s32 hour, s32 minute, s32 second)
 {
     dest = ConvertIntToDecimalStringN(dest, hour, STR_CONV_MODE_LEADING_ZEROS, 2);
     *dest++ = CHAR_COLON;
@@ -225,7 +225,7 @@ void FormatDecimalTime(u8 *dest, s32 hour, s32 minute, s32 second)
     *dest = EOS;
 }
 
-void FormatHexTime(u8 *dest, s32 hour, s32 minute, s32 second)
+static void UNUSED FormatHexTime(u8 *dest, s32 hour, s32 minute, s32 second)
 {
     dest = ConvertIntToHexStringN(dest, hour, STR_CONV_MODE_LEADING_ZEROS, 2);
     *dest++ = CHAR_COLON;
@@ -235,12 +235,12 @@ void FormatHexTime(u8 *dest, s32 hour, s32 minute, s32 second)
     *dest = EOS;
 }
 
-void FormatHexRtcTime(u8 *dest)
+static void UNUSED FormatHexRtcTime(u8 *dest)
 {
     FormatHexTime(dest, sRtc.hour, sRtc.minute, sRtc.second);
 }
 
-void FormatDecimalDate(u8 *dest, s32 year, s32 month, s32 day)
+static void UNUSED FormatDecimalDate(u8 *dest, s32 year, s32 month, s32 day)
 {
     dest = ConvertIntToDecimalStringN(dest, year, STR_CONV_MODE_LEADING_ZEROS, 4);
     *dest++ = CHAR_HYPHEN;
@@ -250,7 +250,7 @@ void FormatDecimalDate(u8 *dest, s32 year, s32 month, s32 day)
     *dest = EOS;
 }
 
-void FormatHexDate(u8 *dest, s32 year, s32 month, s32 day)
+static void UNUSED FormatHexDate(u8 *dest, s32 year, s32 month, s32 day)
 {
     dest = ConvertIntToHexStringN(dest, year, STR_CONV_MODE_LEADING_ZEROS, 4);
     *dest++ = CHAR_HYPHEN;
diff --git a/src/siirtc.c b/src/siirtc.c
index 0e598f7172..3557685850 100644
--- a/src/siirtc.c
+++ b/src/siirtc.c
@@ -344,7 +344,7 @@ bool8 SiiRtcSetTime(struct SiiRtcInfo *rtc)
     return TRUE;
 }
 
-bool8 SiiRtcSetAlarm(struct SiiRtcInfo *rtc)
+static bool8 UNUSED SiiRtcSetAlarm(struct SiiRtcInfo *rtc)
 {
     u8 i;
     u8 alarmData[2];